xref: /openbmc/u-boot/scripts/Makefile.build (revision 68968901) 
1# ==========================================================================
2# Building
3# ==========================================================================
4
5# Modified for U-Boot
6prefix := tpl
7src := $(patsubst $(prefix)/%,%,$(obj))
8ifeq ($(obj),$(src))
9prefix := spl
10src := $(patsubst $(prefix)/%,%,$(obj))
11ifeq ($(obj),$(src))
12prefix := .
13endif
14endif
15
16PHONY := __build
17__build:
18
19# Init all relevant variables used in kbuild files so
20# 1) they have correct type
21# 2) they do not inherit any value from the environment
22obj-y :=
23obj-m :=
24lib-y :=
25lib-m :=
26always :=
27targets :=
28subdir-y :=
29subdir-m :=
30EXTRA_AFLAGS   :=
31EXTRA_CFLAGS   :=
32EXTRA_CPPFLAGS :=
33EXTRA_LDFLAGS  :=
34asflags-y  :=
35ccflags-y  :=
36cppflags-y :=
37ldflags-y  :=
38
39subdir-asflags-y :=
40subdir-ccflags-y :=
41
42# Read auto.conf if it exists, otherwise ignore
43# Modified for U-Boot
44-include $(prefix)/include/config/auto.conf
45-include $(prefix)/include/autoconf.mk
46
47include scripts/Kbuild.include
48
49# For backward compatibility check that these variables do not change
50save-cflags := $(CFLAGS)
51
52# The filename Kbuild has precedence over Makefile
53kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
54kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
55include $(kbuild-file)
56
57# Added for U-Boot
58asflags-y  += $(PLATFORM_CPPFLAGS)
59ccflags-y  += $(PLATFORM_CPPFLAGS)
60cppflags-y += $(PLATFORM_CPPFLAGS)
61
62# If the save-* variables changed error out
63ifeq ($(KBUILD_NOPEDANTIC),)
64        ifneq ("$(save-cflags)","$(CFLAGS)")
65                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
66        endif
67endif
68
69#
70# make W=... settings
71#
72# W=1 - warnings that may be relevant and does not occur too often
73# W=2 - warnings that occur quite often but may still be relevant
74# W=3 - the more obscure warnings, can most likely be ignored
75#
76# $(call cc-option, -W...) handles gcc -W.. options which
77# are not supported by all versions of the compiler
78ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
79warning-  := $(empty)
80
81warning-1 := -Wextra -Wunused -Wno-unused-parameter
82warning-1 += -Wmissing-declarations
83warning-1 += -Wmissing-format-attribute
84warning-1 += $(call cc-option, -Wmissing-prototypes)
85warning-1 += -Wold-style-definition
86warning-1 += $(call cc-option, -Wmissing-include-dirs)
87warning-1 += $(call cc-option, -Wunused-but-set-variable)
88warning-1 += $(call cc-disable-warning, missing-field-initializers)
89
90# Clang
91warning-1 += $(call cc-disable-warning, initializer-overrides)
92warning-1 += $(call cc-disable-warning, unused-value)
93warning-1 += $(call cc-disable-warning, format)
94warning-1 += $(call cc-disable-warning, unknown-warning-option)
95warning-1 += $(call cc-disable-warning, sign-compare)
96warning-1 += $(call cc-disable-warning, format-zero-length)
97warning-1 += $(call cc-disable-warning, uninitialized)
98warning-1 += $(call cc-option, -fcatch-undefined-behavior)
99
100warning-2 := -Waggregate-return
101warning-2 += -Wcast-align
102warning-2 += -Wdisabled-optimization
103warning-2 += -Wnested-externs
104warning-2 += -Wshadow
105warning-2 += $(call cc-option, -Wlogical-op)
106warning-2 += $(call cc-option, -Wmissing-field-initializers)
107
108warning-3 := -Wbad-function-cast
109warning-3 += -Wcast-qual
110warning-3 += -Wconversion
111warning-3 += -Wpacked
112warning-3 += -Wpadded
113warning-3 += -Wpointer-arith
114warning-3 += -Wredundant-decls
115warning-3 += -Wswitch-default
116warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
117warning-3 += $(call cc-option, -Wvla)
118
119warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
120warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
121warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
122
123ifeq ("$(strip $(warning))","")
124        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
125endif
126
127KBUILD_CFLAGS += $(warning)
128endif
129
130include scripts/Makefile.lib
131
132ifdef host-progs
133ifneq ($(hostprogs-y),$(host-progs))
134$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
135hostprogs-y += $(host-progs)
136endif
137endif
138
139# Do not include host rules unless needed
140ifneq ($(hostprogs-y)$(hostprogs-m),)
141include scripts/Makefile.host
142endif
143
144# Uncommented for U-Boot
145#  We need to create output dicrectory for SPL and TPL even for in-tree build
146#ifneq ($(KBUILD_SRC),)
147# Create output directory if not already present
148_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
149
150# Create directories for object files if directory does not exist
151# Needed when obj-y := dir/file.o syntax is used
152_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
153#endif
154
155ifndef obj
156$(warning kbuild: Makefile.build is included improperly)
157endif
158
159# ===========================================================================
160
161ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
162lib-target := $(obj)/lib.a
163endif
164
165ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
166builtin-target := $(obj)/built-in.o
167endif
168
169modorder-target := $(obj)/modules.order
170
171# We keep a list of all modules in $(MODVERDIR)
172
173__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
174	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
175	 $(subdir-ym) $(always)
176	@:
177
178# Linus' kernel sanity checking tool
179ifneq ($(KBUILD_CHECKSRC),0)
180  ifeq ($(KBUILD_CHECKSRC),2)
181    quiet_cmd_force_checksrc = CHECK   $<
182          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
183  else
184      quiet_cmd_checksrc     = CHECK   $<
185            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
186  endif
187endif
188
189# Do section mismatch analysis for each module/built-in.o
190ifdef CONFIG_DEBUG_SECTION_MISMATCH
191  cmd_secanalysis = ; scripts/mod/modpost $@
192endif
193
194# Compile C sources (.c)
195# ---------------------------------------------------------------------------
196
197# Default is built-in, unless we know otherwise
198modkern_cflags =                                          \
199	$(if $(part-of-module),                           \
200		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
201		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
202quiet_modtag := $(empty)   $(empty)
203
204$(real-objs-m)        : part-of-module := y
205$(real-objs-m:.o=.i)  : part-of-module := y
206$(real-objs-m:.o=.s)  : part-of-module := y
207$(real-objs-m:.o=.lst): part-of-module := y
208
209$(real-objs-m)        : quiet_modtag := [M]
210$(real-objs-m:.o=.i)  : quiet_modtag := [M]
211$(real-objs-m:.o=.s)  : quiet_modtag := [M]
212$(real-objs-m:.o=.lst): quiet_modtag := [M]
213
214$(obj-m)              : quiet_modtag := [M]
215
216# Default for not multi-part modules
217modname = $(basetarget)
218
219$(multi-objs-m)         : modname = $(modname-multi)
220$(multi-objs-m:.o=.i)   : modname = $(modname-multi)
221$(multi-objs-m:.o=.s)   : modname = $(modname-multi)
222$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
223$(multi-objs-y)         : modname = $(modname-multi)
224$(multi-objs-y:.o=.i)   : modname = $(modname-multi)
225$(multi-objs-y:.o=.s)   : modname = $(modname-multi)
226$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
227
228quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
229cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
230
231$(obj)/%.s: $(src)/%.c FORCE
232	$(call if_changed_dep,cc_s_c)
233
234quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
235cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
236
237$(obj)/%.i: $(src)/%.c FORCE
238	$(call if_changed_dep,cc_i_c)
239
240cmd_gensymtypes =                                                           \
241    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
242    $(GENKSYMS) $(if $(1), -T $(2))                                         \
243     $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
244     $(if $(KBUILD_PRESERVE),-p)                                            \
245     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
246
247quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
248cmd_cc_symtypes_c =                                                         \
249    set -e;                                                                 \
250    $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
251    test -s $@ || rm -f $@
252
253$(obj)/%.symtypes : $(src)/%.c FORCE
254	$(call cmd,cc_symtypes_c)
255
256# C (.c) files
257# The C file is compiled and updated dependency information is generated.
258# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
259
260quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
261
262ifndef CONFIG_MODVERSIONS
263cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
264
265else
266# When module versioning is enabled the following steps are executed:
267# o compile a .tmp_<file>.o from <file>.c
268# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
269#   not export symbols, we just rename .tmp_<file>.o to <file>.o and
270#   are done.
271# o otherwise, we calculate symbol versions using the good old
272#   genksyms on the preprocessed source and postprocess them in a way
273#   that they are usable as a linker script
274# o generate <file>.o from .tmp_<file>.o using the linker to
275#   replace the unresolved symbols __crc_exported_symbol with
276#   the actual value of the checksum generated by genksyms
277
278cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
279cmd_modversions =								\
280	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\
281		$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\
282		    > $(@D)/.tmp_$(@F:.o=.ver);					\
283										\
284		$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 			\
285			-T $(@D)/.tmp_$(@F:.o=.ver);				\
286		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);		\
287	else									\
288		mv -f $(@D)/.tmp_$(@F) $@;					\
289	fi;
290endif
291
292ifdef CONFIG_FTRACE_MCOUNT_RECORD
293ifdef BUILD_C_RECORDMCOUNT
294ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
295  RECORDMCOUNT_FLAGS = -w
296endif
297# Due to recursion, we must skip empty.o.
298# The empty.o file is created in the make process in order to determine
299#  the target endianness and word size. It is made before all other C
300#  files, including recordmcount.
301sub_cmd_record_mcount =					\
302	if [ $(@) != "scripts/mod/empty.o" ]; then	\
303		$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";	\
304	fi;
305recordmcount_source := $(srctree)/scripts/recordmcount.c \
306		    $(srctree)/scripts/recordmcount.h
307else
308sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
309	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
310	"$(if $(CONFIG_64BIT),64,32)" \
311	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
312	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
313	"$(if $(part-of-module),1,0)" "$(@)";
314recordmcount_source := $(srctree)/scripts/recordmcount.pl
315endif
316cmd_record_mcount = 						\
317	if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then	\
318		$(sub_cmd_record_mcount)			\
319	fi;
320endif
321
322define rule_cc_o_c
323	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
324	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
325	$(cmd_modversions)						  \
326	$(call echo-cmd,record_mcount)					  \
327	$(cmd_record_mcount)						  \
328	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
329	                                              $(dot-target).tmp;  \
330	rm -f $(depfile);						  \
331	mv -f $(dot-target).tmp $(dot-target).cmd
332endef
333
334# Built-in and composite module parts
335$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
336	$(call cmd,force_checksrc)
337	$(call if_changed_rule,cc_o_c)
338
339# Single-part modules are special since we need to mark them in $(MODVERDIR)
340
341$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
342	$(call cmd,force_checksrc)
343	$(call if_changed_rule,cc_o_c)
344	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
345
346quiet_cmd_cc_lst_c = MKLST   $@
347      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
348		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
349				     System.map $(OBJDUMP) > $@
350
351$(obj)/%.lst: $(src)/%.c FORCE
352	$(call if_changed_dep,cc_lst_c)
353
354# Compile assembler sources (.S)
355# ---------------------------------------------------------------------------
356
357modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
358
359$(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
360$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
361
362quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
363cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
364
365$(obj)/%.s: $(src)/%.S FORCE
366	$(call if_changed_dep,as_s_S)
367
368quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
369cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
370
371$(obj)/%.o: $(src)/%.S FORCE
372	$(call if_changed_dep,as_o_S)
373
374targets += $(real-objs-y) $(real-objs-m) $(lib-y)
375targets += $(extra-y) $(MAKECMDGOALS) $(always)
376
377# Linker scripts preprocessor (.lds.S -> .lds)
378# ---------------------------------------------------------------------------
379quiet_cmd_cpp_lds_S = LDS     $@
380      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
381	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
382
383$(obj)/%.lds: $(src)/%.lds.S FORCE
384	$(call if_changed_dep,cpp_lds_S)
385
386# ASN.1 grammar
387# ---------------------------------------------------------------------------
388quiet_cmd_asn1_compiler = ASN.1   $@
389      cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
390				$(subst .h,.c,$@) $(subst .c,.h,$@)
391
392.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
393
394$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
395	$(call cmd,asn1_compiler)
396
397# Build the compiled-in targets
398# ---------------------------------------------------------------------------
399
400# To build objects in subdirs, we need to descend into the directories
401$(sort $(subdir-obj-y)): $(subdir-ym) ;
402
403#
404# Rule to compile a set of .o files into one .o file
405#
406ifdef builtin-target
407quiet_cmd_link_o_target = LD      $@
408# If the list of objects to link is empty, just create an empty built-in.o
409cmd_link_o_target = $(if $(strip $(obj-y)),\
410		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
411		      $(cmd_secanalysis),\
412		      rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
413
414$(builtin-target): $(obj-y) FORCE
415	$(call if_changed,link_o_target)
416
417targets += $(builtin-target)
418endif # builtin-target
419
420#
421# Rule to create modules.order file
422#
423# Create commands to either record .ko file or cat modules.order from
424# a subdirectory
425modorder-cmds =						\
426	$(foreach m, $(modorder),			\
427		$(if $(filter %/modules.order, $m),	\
428			cat $m;, echo kernel/$m;))
429
430$(modorder-target): $(subdir-ym) FORCE
431	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
432
433#
434# Rule to compile a set of .o files into one .a file
435#
436ifdef lib-target
437quiet_cmd_link_l_target = AR      $@
438cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
439
440$(lib-target): $(lib-y) FORCE
441	$(call if_changed,link_l_target)
442
443targets += $(lib-target)
444endif
445
446#
447# Rule to link composite objects
448#
449#  Composite objects are specified in kbuild makefile as follows:
450#    <composite-object>-objs := <list of .o files>
451#  or
452#    <composite-object>-y    := <list of .o files>
453link_multi_deps =                     \
454$(filter $(addprefix $(obj)/,         \
455$($(subst $(obj)/,,$(@:.o=-objs)))    \
456$($(subst $(obj)/,,$(@:.o=-y)))), $^)
457
458quiet_cmd_link_multi-y = LD      $@
459cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
460
461quiet_cmd_link_multi-m = LD [M]  $@
462cmd_link_multi-m = $(cmd_link_multi-y)
463
464# We would rather have a list of rules like
465# 	foo.o: $(foo-objs)
466# but that's not so easy, so we rather make all composite objects depend
467# on the set of all their parts
468$(multi-used-y) : %.o: $(multi-objs-y) FORCE
469	$(call if_changed,link_multi-y)
470
471$(multi-used-m) : %.o: $(multi-objs-m) FORCE
472	$(call if_changed,link_multi-m)
473	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
474
475targets += $(multi-used-y) $(multi-used-m)
476
477
478# Descending
479# ---------------------------------------------------------------------------
480
481PHONY += $(subdir-ym)
482$(subdir-ym):
483	$(Q)$(MAKE) $(build)=$@
484
485# Add FORCE to the prequisites of a target to force it to be always rebuilt.
486# ---------------------------------------------------------------------------
487
488PHONY += FORCE
489
490FORCE:
491
492# Read all saved command lines and dependencies for the $(targets) we
493# may be building above, using $(if_changed{,_dep}). As an
494# optimization, we don't need to read them if the target does not
495# exist, we will rebuild anyway in that case.
496
497targets := $(wildcard $(sort $(targets)))
498cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
499
500ifneq ($(cmd_files),)
501  include $(cmd_files)
502endif
503
504# Declare the contents of the .PHONY variable as phony.  We keep that
505# information in a variable se we can use it in if_changed and friends.
506
507.PHONY: $(PHONY)
508